For the second time this week, authorities have postponed a news conference about the investigation of Mollie Tibbetts' disappearance.

Last week, the Iowa Department of Public Safety announced that it expected to update reporters and the public on Tuesday and again on Friday. But the Tuesday gathering was canceled, and on Thursday afternoon, the Friday conference was postponed to Monday afternoon.

Previous news conferences have illuminated little about the search, with state authorities saying it was important to keep some details confidential to protect the integrity of the investigation.

"At this time the investigative team, made up of dedicated members from the Poweshiek County Sheriff’s Office, the Iowa DCI and the FBI, are continuing to follow up on investigative leads and tips," the state said in a news release Thursday. "Information is still coming in and the investigation remains active. The team continues to encourage the public to submit any information they may have in regards to Mollie’s disappearance."